We use Flaps 40 most of the time unless the missed approach climb limit weight is against us.....then we use flaps 30. I have had to do bleeds off cat 3 approachs sometimes when our weights were so high.....this is a pain as the work load is through the roof together with the cat 3 stuff. our ops man has if i can remember nearly a 4 ton penalty for icing enroute and this stuffs us re above.